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A new method for the determination of cadmium at ultratrace levels using slotted quartz tube-flame atomic absorption spectrometry after preconcentration with stearic acid coated magnetite nanoparticles
Journal of Analytical Atomic Spectrometry ( IF 3.4 ) Pub Date : 2017-10-27 00:00:00 , DOI: 10.1039/c7ja00303j
Erhan Akkaya 1, 2, 3, 4 , Nursu Aylin Kasa 1, 2, 3, 4 , Gülten Çetin 1, 2, 3, 4 , Sezgin Bakirdere 1, 2, 3, 4
Affiliation  

A combination of slotted quartz tube attached flame atomic absorption spectrometry (SQT-FAAS) and stearic acid coated magnetite nanoparticle based solid phase microextraction (SPME-MNP) was used for the determination of ultratrace amounts of cadmium. Coated magnetite nanoparticles were used for the extraction of cadmium from aqueous samples by providing a large surface area with the help of their surfactant properties. The separation of the extracted cadmium from the aqueous phase was facilitated by the application of an external magnetic field. Several experimental variables such as the mixing type, duration of mixing, pH of buffer solution and amount of eluent were optimized in order to enhance the extraction efficiency for cadmium. Under the optimum experimental and instrumental conditions, 0.11 μg L−1 limit of detection (LOD) and 0.36 μg L−1 limit of quantification (LOQ) were obtained. Recovery tests were carried out to investigate the effect of a sample matrix on the developed method and the percent recoveries obtained were between 97 and 105% for spiked lake water and urine samples. A standard reference material of tomato leaves (NIST 1573a) was also analysed to validate the accuracy of the developed method and the experimental result agreed with the certified value. Low percent relative standard deviation values also indicated high precision.

中文翻译:

硬脂酸涂层磁铁矿纳米粒子预富集后使用缝隙石英管火焰原子吸收光谱法测定超痕量镉的新方法

缝隙石英管连接火焰原子吸收光谱法(SQT-FAAS)和硬脂酸涂层磁铁矿纳米颗粒基固相微萃取(SPME-MNP)的组合用于测定痕量镉。涂覆的磁铁矿纳米颗粒通过其表面活性剂特性提供较大的表面积,从而用于从水性样品中提取镉。外部磁场的施加促进了从水相中分离出的镉的分离。优化了几个实验变量,例如混合类型,混合持续时间,缓冲溶液的pH值和洗脱液的量,以提高镉的提取效率。在最佳实验和仪器条件下,0.11μgL -1获得了检测极限(LOD)和0.36μgL -1定量极限(LOQ)。进行了回收率测试,以研究样品基质对开发的方法的影响,对于加标的湖水和尿液样品,回收率在97%至105%之间。还分析了番茄叶片的标准参考物质(NIST 1573a),以验证所开发方法的准确性,并且实验结果与认证值相符。相对标准偏差百分比值低也表示精度高。
更新日期:2017-11-15
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